<!DOCTYPE html> 
<html> 
	<head>
		<meta charset="utf-8" />
	</head>
<body> 

<div style="text-align:center;">
  <button onclick="playPause()">播放/暂停</button> 
  <button onclick="makeBig()">大</button>
  <button onclick="makeNormal()">中</button>
  <button onclick="makeSmall()">小</button>
  <br /> 
  <video id="video1" width="420" style="margin-top:15px;" controls="controls">
    <source src="video/mov_bbb.mp4" type="video/mp4" />
    <source src="video/mov_bbb.ogg" type="video/ogg" />
    Your browser does not support HTML5 video.
  </video>
</div> 

<audio controls="controls">
  <source src="video/song.ogg" type="audio/ogg">
  <source src="video/song.mp3" type="audio/mpeg">
Your browser does not support the audio tag.
</audio>

<script type="text/javascript">
var myVideo=document.getElementById("video1");

function playPause()
{ 
if (myVideo.paused) 
  myVideo.play(); 
else 
  myVideo.pause(); 
} 

function makeBig()
{ 
myVideo.width=560; 
} 

function makeSmall()
{ 
myVideo.width=320; 
} 

function makeNormal()
{ 
myVideo.width=420; 
} 
</script> 

</body> 
</html>
